Technical Information

CAS / CASR / CKSR series Current Transducers
Insulated Highly Accurate Measurementsfrom 1.5 to 50 ARMS

CAS / CASR / CKSR series Current Transducers

Future precision.
Future performances.
Now available.

CAS / CASR / CKSR series Current Transducers
Insulated Highly Accurate Measurements from 1.5 to 50 A RMS
The Power Electronics market is in constant change andalways on the lookout for new technologies and better
performance driving our progress. To enable applications
with enhanced performance, current measurement must
always been made with the best possible performance
also allowing to the final application to differentiate itself
from all the others.
This is the human nature and allows the progress oftechnology.
With the LTS / LTSR current transducers using the Closed
Loop Hall effect technology coupled with a dedicated
ASIC (Application Specific Integrated Circuit) speciallydesigned for these products, we thought we had reached
the optimal performance, but this was without taking theeternal human nature into account.
The market required even better accuracy over thetemperature ranges maintaining a low price and LEM
decided to achieve this goal.
A few months later, LEM delivers the solution with the
CAS / CASR / CKSR current transducers series covering
nominal current measurements from 1,5 to 50 A RMS.
To respond to these new challenges, the Hall effecttechnology was no longer the solution. Even if used
in a Closed Loop configuration and with the use of a
dedicated ASIC as done with the LTS family which allowed
a substantial performance improvement notably for theaccuracy and the size.
Fluxgate technology was selected enabling both possible
targets: the improvement in accuracy and the low price.

Without compromising the advantages of the LTS productsuch as size, dynamic performances, high measuring
range, ect.
LEM has already been using multiple Fluxgate technologies
in the past and it was just a question to find the one making
the best comprise between price, size and performances.
In order for the products to be able to work in the typicalindustrial applications, the insulation criteria needed to berespected and a particular attention has then been brought
to the mechanical design of the product.
Although we were able to reduce the size even when
nobody thought it could still be done, the insulation
performances allow usage in standard industrial
applications without particular mounting with a rated
insulation voltage up to 1000 VRMS (Simple isolationaccording to EN 50178 standard with following parameters:
OV 3, PD2).
The CAS / CASR / CKSR models have been speciallydesigned to respond to the technology advances in drives
and inverters in industrial environment requiring better
performances in areas such as:• Common mode influence• Thermal drift (offset and gain)• Accuracy (in the whole temperature range)• Response time
• Insulation• SizeClosed Loop current transducers measure current overwide frequency ranges, including DC. They provide
contact-free coupling to the current that needs to bemeasured as well as safe galvanic isolation and highreliability. Their output signal is an accurate, high-resolution
image of the primary current with a very short delay.

in the electronics (e.g. offset variations of the amplifiers
used) if the Open Loop sensitivity is higher.
The complexity of a Fluxgate based current transducer
is comparable to the one of a transducer based on a Hall
effect IC (integrated circuit). Like there, some AC signal
processing and synchronous rectifying is applied. In
addition, the Fluxgate detector is needed. Fortunately,
this Fluxgate is a very simple small solenoid with a tiny
soft magnetic strip used as detector core. Because of
the complexity of the signal chain, an IC is used to stayat a competitive cost level compared to Hall effect current
transducers. A circuit in this IC forms an oscillator together
with the Fluxgate, driving it into saturation each half cycle
at a frequency of several hundred kilohertz. The effectthat is used for the detection of a residual flux in the maintransducer core is the fact that in such a configuration achange of the duty cycle of the driving voltage will occur
when a magnetic DC flux is present in the fluxgate core.

In higher frequency ranges these transducers function
exactly the same way as (passive) current transformers,
where a relatively small induced voltage in the secondary
winding is capable to drive the secondary current throughthe secondary winding and, most important, throughthe burden resistor. A low induced voltage equals low
magnetic flux in the magnetic core, which is the cause
for the good accuracy (low flux means a small difference
between primary and secondary current linkage1, too).
For DC and in low-frequency ranges, the induced voltage
is too low to be able to drive the secondary current, andthe error of simple current transformers will increase withdecreasing frequency. In this domain, the magnetic flux
density in the core is measured by a sensing element anda voltage is applied to the secondary circuit that in theend keeps the flux density near zero, effectively creating aclosed control loop.

The signal processing stages in the IC comprise a duty
cycle demodulation, frequency response compensation,
an integrator and a bridge amplifier that provides thesecondary current. This output architecture can provide
a higher (doubled) voltage to the secondary circuit whencompared to a single output stage with the other side of thecircuit connected to a reference potential at typically 2.5 V.

The only basic difference between the CAS / CASR / CKSR
transducer series and standard Closed Loop transducersof LEM is that the Hall element used for feedback isreplaced by a Fluxgate detector. The driving force behind
this choice is the need for a “better” feedback, whichbasically means more voltage per current linkage, aquantity that is called “Open Loop sensitivity”. Givenan equal electronic circuit, the zero output of a current
transducer (traditionally called “offset” in analogy tooperational amplifiers) will be less influenced by changes

In this configuration, the burden (or measurement) resistor
is floating, so in order to obtain an output signal referenced
to a fixed voltage, a difference amplifier is used which isalso part of the IC.

1 Current linkage is the technical term for current multiplied by turns countFig. 1. Closed Loop Fluxgate Technology used for the CAS / CASR / CKSR current transducers

Magnetic CoreRS
Primary conductor
I Compensation
Diff
Amp

ICOMP1

Fluxgate
InterfaceIP

Filter

GND

+5V
VOUT

Driver

VREF

Int. ref
ICOMP2Compensation
Winding

FluxgateCAS / CASR / CKSR Transducers Technology

CAS / CASR / CKSR Transducers Technology:
Closed Loop Fluxgate technology

CAS / CASR / CKSR Series: Main Characteristics

Mechanical and dimensions
CAS / CASR / CKSR have been designed to provide
current measurements from 6 to 50 A RMS in a very
compact size compared to the existing current
transducers based on different technologies allowing toreach similar electrical performances.
Moreover, the same compact design is used to cover
the complete current range from 6 to 50 A RMS with 4

standard models (6 A, 15 A, 25 A and 50 A models) for
each series CAS, CASR and CKSR.
The CAS / CASR / CKSR design is 30 % smaller inheight than LTS transducer (Closed Loop Hall effectchip technology using an ASIC): 16.5 mm height versus
24 mm. 7.5 mm won in height !

Where LTS and LTSR were limited
to 25 A RMS, with the respective
LTS 25-NP
and
LTSR 25-NP
models, as the highest nominal
current, the CAS / CASR / CKSR
models are offered with a model
expected to measure 50 A RMS as
nominal current. There has beena requirement from the market for
years to have a 100% PCB mounted
50 A RMS current transducer withsingle + 5 V power supply in such aclass accuracy.

Transducers dimensions

Fig. 2. CAS / CASR / CKSR: 30 % smaller compared to the LTS / LTSR models

The CAS and CASR construction uses three U‑shaped primary terminals integrated into the housing, providing thedesigner with a great flexibility to perfectly adapt the measuring range of the current transducer to his application.
Fig. 4a shows the different connection possibilities.
Numberof primaryturns

Primary nominal
current rms
I PN [ A ]Nominal*output voltage
VOUT [ V ]Primary resistanceR P [ mΩ ] ( typ. )at +25° C

1± 25

2.5 ± 0.625

0.24

2

± 12

2.5 ± 0.600

1.08

3

±8

2.5 ± 0.600

2.16

Recommended
connections* Output voltage CASR 25‑NP is used with internal reference.

Fig. 4a. Different nominal current ranges possible according to the primary current circuit configuration (as example: CAS or CASR 25-NP)

Variant 1

Variant 2
When all three U-shaped terminals are connected inparallel (variant 1 Fig. 4b) the user can measure themaximum nominal primary current.

Expected for:I PN (I PMAX ) = 25 A (85 A max)

Expected for:
IPN / 3 (IPMAX / 3) = 8.33 A (28.33 A max)

Fig. 4b. The 2 extreme possibilities for connecting the primary
current circuit (as example: CAS or CASR 25-NP)

The variant 2 (Fig.4b) corresponds to a series connectionof the primary terminals and leads to a reduction of thenominal measuring range by a factor of 3, but offering a
3 times higher accuracy for low currents.

The CAS / CASR models are 100% compatible
with the LTS and LTSR models in regards tothe footprint mounting and also with all theother models that are available on the market
with the same footprint as the LTS / LTSR.

Fig. 3. CAS and CASR transducers can be mounted at theexact place of the LTS and LTSR transducers

CAS / CASR / CKSR Series: Main Characteristics

Multifunctional primary circuit

CAS / CASR / CKSR Series: Mechanical differences

CAS / CASR / CKSR Mechanical differences
Ref IN/OUT*Nb
on aprimary
secondarypins
pin

Nominalcurrentrange

Nb
secondarypins

CAS 6-NP

6

3

NO

CAS 15-NP

15

3

CAS 25-NP

25

CAS 50-NP

3D
drawing

Footprint
drawingCompatibility
with
LTS and LTSR
footprints

Creepagedistance

Clearance
distance3

7.7 mm

7.7 mm

LTS 6-NPNO

3

7.7 mm

7.7 mm

LTS 15-NP

3

NO

3

7.7 mm

7.7 mm

LTS 25-NP

50

3

NO

3

7.7 mm

7.7 mmLTS

CASR 6-NP

6

4

YES

3

7.5 mm

7.5 mmLTSR 6-NP

CASR 15-NP

15

4

YES

3

7.5 mm

7.5 mmLTSR 15-NP

CASR 25-NP

25

4

YES

3

7.5 mm

7.5 mmLTSR 25-NP

CASR 50-NP

50

4

YES

3

7.5 mm

7.5 mmLTSR

CKSR 6-NP

6

4

YES

4

8.2 mm

8.2 mm/CKSR 15-NP

15

4

YES

4

8.2 mm

8.2 mm/CKSR 25-NP

25

4

YES

4

8.2 mm

8.2 mm/CKSR 50-NP

50

4

YES

4

8.2 mm

8.2 mm/Model

CAS Series

CASR Series

CKSR Series* The internal reference voltage is provided on a secondary pin or can be forced by an external reference voltage

The CKSR has one more primary pin (4 primary pins in
total) than the CAS and CASR models (3 primary pins in
total) making it incompatible with the footprint of these last
8 models. It is possible to measure not less than 1.5 ARMS
nominal (using a CKSR 6-NP model set up in one of the 4
possible primary pins layout: Layout with 4 turns. Fig. 5) withthe performances mentioned in the CKSR 6-NP data sheet.

Using this layout configuration, the current measured by
the transducer is still 6 ARMS (its designed nominal current)
as when connected in series the primary pins have 4 loops(instead of 1 when connected in parallel) through the apertureof the transducer.
Then 4 loops, carrying 1.5 A each, results into a total current of
6 A.t (Amps.turn). Finally, the transducer “sees” a 6 A current.

Numberof primaryturns

Primary nominal
current rms
I PN [ A ]Nominal*output voltage
VOUT [ V ]Primary resistanceR P [ mΩ ] ( typ. )at +25° C

1±62.5 ± 0.625

0.18

2

±3

2.5 ± 0.625

0.72

3

±2

2.5 ± 0.625

1.8

4

± 1.5

2.5 ± 0.625

2.88

Recommended
connections* Output voltage CKSR 6‑NP is used with internal reference.

Fig. 5. Different nominal current ranges possible according to the primary current circuit configuration – CKSR 6-NP model as example
allows nominal current measurement from 1.5 to 6 A RMS

With that value, and PD2 and CTI of 600 V (group I), this leads toa possible rated insulation voltage of 800 VRMS.

The CKSR primary pin footprint is different to the CAS and
CASR models.

In conclusion, the possible reinforced rated insulation voltage, inthese conditions of use, is of 450 VRMS (interpolation) or 300 VRMS
(without interpolation)(the lowest value given by the both resultsfrom the creepage and clearance distances).

Thanks to this different primary footprint, higher creepage andclearance distances are achieved.
This can be of interest when higher insulation is required for
applications under higher working voltages than normal.
Creepage and clearance distances for CKSR models are
8.2 mm (internal distances).
Let’s take an example to see the advance this brings.

Conditions of use:
• Creepage distance: 8.2 mm• Clearance distance: 8.2 mm• CTI: 600 V (group I)• Overvoltage category: III• Pollution Degree: 2

Basic or Single insulation:
According to EN 50178 and IEC 61010-1standards:
With clearance distance of 8.2 mm and PD2 and OV III, the rated
insulation voltage is of 1000 VRMS.
With a creepage distance of 8.2 mm and PD2 and CTI of 600 V(group I), this leads to a possible rated insulation voltage of1600 VRMS.
In conclusion, the possible rated insulation voltage, in these
conditions of use, is 1000 VRMS (the lowest value given by theboth results from the creepage and clearance distances).
Reinforced insulation:
Let’s look at the reinforced insulation for the same creepage andclearance distances as previously defined:

Using only the EN 50178 standard as a reference for industrial
applications, the possible reinforced rated insulation voltage inthese conditions of use is of 600 VRMS.
With CASR models, not using the special primary pins footprint,
the clearance and creepage distances are each of 7.5 mm.
In the same conditions of use as for the CKSR example here
before, the result would be the following:
According to EN 50178 and IEC 61010-1 standards:
Basic or Single insulation ➔ Rated insulation voltage: 600 VRMS.
Reinforced insulation ➔ Rated insulation voltage: 404 VRMS
(interpolation) or 300 VRMS (without interpolation).
With CAS models, not using the special primary pins footprint,
the clearance and creepage distances are each of 7.7 mm(distances are higher compared to the CASR models as there
are only 3 secondary pins versus 4 on the CASR models).
In the same conditions of use as for the CKSR example here
before, the result would be the following:
According to EN 50178 and IEC 61010-1 standards:
Basic or Single insulation ➔ Rated insulation voltage: 600 VRMS.
Reinforced insulation ➔ Rated insulation voltage: 417 VRMS
(interpolation) or 300 VRMS (without interpolation).
(Note: all these calculations are done with creepage andclearance distances taken on the transducer itself not mounted
on a PCB).

When looking at dimensioning reinforced insulation, from theclearance distance point of view, with OV III and according
to EN 50178 and IEC 61010-1 standards, the rated insulation
voltage is given whatever the pollution degree at 450 VRMS
(interpolation) or 300 VRMS (without interpolation).
From the creepage distance point of view, when dimensioning
reinforced insulation, the creepage distance taken into accounthas to be the real creepage distance divided by 2, that is to say
8.2 / 2 = 4.1 mm.

The measurement of differential currents
is also possible with special versions ofCAS, CASR and CKSR (Fig. 6). Thesemodels are possible on request. The
current measured is the differenceof the currents I1 - I2. For insulation
reasons (creepage and clearance
distances), these models are designed
in order to have enough space between
the 2 primary conductors carrying the 2
opposite currents (due to the possible
potential difference between the twophases).

Fig. 6: Differential current measurement (I = I1 – I2), many possibilities

CAS / CASR / CKSR Series: Mechanical & Insulation features

Higher insulation provided with the CKSR models thanks to theirmechanical design

CAS / CASR / CKSR Series: Electrical performances

Electrical data
CAS / CASR / CKSR current transducers series have been
designed to work with a single + 5 V power supply to covernominal current measurements from 6 to 50 ARMS.
This is a common power supply used in the power electronics
word to make working the various µprocessors, or DSPs or
ADCs (Analog Digital Converters) ect.
The models provide an analogue voltage output referenced
around a reference voltage.
By default, this reference voltage is the internal reference
voltage used inside the transducer: 2.5 V + a certain tolerance(please see adequate data sheet according to the model).

voltage at the Ref pin + an offset depending to the model
used (between the voltage output and the Ref pin).
The voltage provided at the Ref pin (Typically 2.5 V) stays
stable although the primary current changes.
The second mode is called “Ref in mode”. In this mode, you
can apply an external voltage to the Ref pin to overdrive theinternal voltage reference. The minimum external voltage is
0 V and maximum 4 V. However, this mode defines different
measuring ranges according to the level of the external
voltage reference used (0 to 4 V) and according to the model
used (6, 15, 25 or 50 A model).

Then, at the output, these 2.5 V provided at no primary
current can be considered as a virtual “0” V.

For more information on these 2 modes, please refer to thechapter “Application advice”.

The gain is defined in order to get 0.625 V at IPN whatever themodel used (CAS or CASR or CKSR, 6 or 15 or 25 or 50 ARMS
models).

With zero primary current, the consumption is max 20 mA.
With more than zero primary current, the transducer
consumes 20 mA max + (the primary current divided by the
number of turns used by the transducer: IP / Ns).

Accuracy
Using a Closed Loop Fluxgate technology allows reaching
accuracy that was impossible with traditional Closed Loop
Hall effect based technology (even with a dedicated ASIC).
Some applications required higher accuracy especially forlower offset and gain drifts in temperature ranges.
CAS / CASR / CKSR models achieve an accuracy of 0.8 %of IPN at +25°C regardless of the model and the following
accuracy at +85°C:

CAS: 2.5 to 3 % of IPN
The output voltage range is limited to between 0.375 V for thenegative current range and 4.625 V for the positive current
range centred around 2.5 V when external reference voltage
is not used.
The positive and negative voltage variation spans are eachof 2.125 V and fluctuate around the internal voltage reference
fixed at 2.5 V.
To define the measuring range, just divide the possible max
voltage variation span (positive or negative) by the gain
defined by the concerned model.
In general, the measuring range provided for each model ismore than 3 times the nominal current.
For the 50 A models (CAS 50-NP, CASR 50-NP and CKSR
50-NP), the current measuring range is limited to +/- 150 A(nevertheless 3 times the nominal current) (due to somecurrent limitations inside the transducer) meaning only
1.875 V as positive and negative variation spans, resulting
in a minimum output voltage of 0.625 V for –150 A and in a
maximum output voltage of 4.375 V for +150 A.
However, for these 50 A models, the limits for output voltage
rails remain +0.375 V and +4.625 V.
With the CASR and CKSR models, the internal voltage
reference is provided on a separate secondary additional pin
called VREF what is not the case with the CAS models.
This pin is a direct access to the voltage reference used
inside set around 2.5 V.
The Ref pin has two basic functional modes:
The first mode is called “Ref out mode”. In this mode, for a
primary current of 0 A, the output voltage is equal to the

CASR: 1.2 to 1.8 % of IPN
CKSR: 1.2 to 1.8 % of IPN
As you can see, the accuracy of the CAS is less good as the
CASR and CKSR models.
This is explained as follows: The CAS models do not provide
the internal voltage reference outside and then the voltage
output integrating the voltage reference inaccuracy.
What is not the case with the CASR and CKSR models
providing their internal voltage reference outside or being
able to feed their internal voltage reference with an external
voltage reference. When using both these last models (CASR
and CKSR), the output (VOUT) is usually measured referenced
to the voltage available on the voltage reference pin (which
one is used as reference for the whole electronic of theapplication).
The voltage reference value available on this pin being wellknown and under control (used and usually controlled by
the microcontroller or DSP), the microcontroller can easily
remove the initial offset at +25°C at no primary current.

The use of the Closed Loop Fluxgate technology allowed achieving significantly better performances for the following
parameters:• Initial offset at +25°C• Offset drift• Gain drift
as expressed per the following charts (Fig. 7: Comparison between CAS and LTS ; CASR and LTSR models).

CAS 6-NP LTS 6-NP CAS 15-NP LTS 15-NP CAS 25-NP LTS 25-NP

Nominal current, I PN

A

6

15

25

Measuring range

A

20

19.2

51

48

85

80

Response time

us

< 0.3

0.4

< 0.3

0.4

< 0.3

0.4

Bandwidth (±1 dB)

kHz

200

200

200

200

200

200

Output voltage noise, 100 Hz..10 kHz (typ.)

mVpp

2.4

10

1.0

4.2

0.6

OutputVoltage

Sensitivity

mV/A

Sensitivity error (max)% of I PN

Offset drift (25°C .. 85°C) (max)% of I PN

1.92

Sensitivity drift (25°C .. 85°C) (max)% of I PN

0.24

Voltage

104.2
0.7

2.5
Voltage

41.7
0.6

25.0

0.7

0.6

0.7

0.6

4.8

1.68

2.9

1.44

2.4

0.3

0.24

0.3

0.24

0.3

Linearity (max)% of I PN

0.1

0.1

0.1

0.1

0.1

0.1

Accuracy at +25 °C (max)% of IPN

0.80

0.70

0.80

0.70

0.80

0.70

Accuracy at +85 °C (max)% of IPN

3.0

5.80

2.7

3.58

2.5

3.40

Offset (max)

mV

10.4

25

7.1

25

6.3

25

Operating temperature range°C-40 .. 85-40 .. 85-40 .. 85-40 .. 85-40 .. 85-40 .. 85

CASR 6-NP LTSR 6-NP CASR 15-NP LTSR 15-NP CASR 25-NP LTSR 25-NP

Nominal current, I PN

A

6

15

25

Measuring range

A

20

19.2

51

48

85

80

Response time

us

< 0.3

0.4

< 0.3

0.4

< 0.3

0.4

Bandwidth (±1 dB)

kHz

200

200

200

200

200

200

Output voltage noise, 100 Hz..10 kHz (typ.)

mVpp

1.7

10

0.7

4.2

0.4

2.5

OutputVoltage

Sensitivity

mV/A

Sensitivity error (max)% of I PN

Offset drift (25°C .. 85°C) (max)Sensitivity drift (25°C .. 85°C) (max)Voltage

104.2

Voltage

41.7

0.7

0.6

0.7

% of I PN

0.72

3.6

% of I PN

0.24

0.3

25.0
0.6

0.7

0.6

0.48

1.5

0.24

0.9

0.24

0.3

0.24

0.3

Linearity (max)% of I PN

0.1

0.1

0.1

0.1

0.1

0.1

Accuracy at +25 °C (max)% of IPN

0.8

0.70

0.8

0.70

0.8

0.70

Accuracy at +85 °C (max)% of IPN

1.8

4.60

1.5

2.54

1.3

1.90

Offset max

mV

5.3

25

2.2

25

1.4

25

Operating temperature range°C-40 .. 85-40 .. 85-40 .. 85-40 .. 85-40 .. 85-40 .. 85

Fig. 7. Comparison between CAS and LTS ; CASR and LTSR models – Electrical performances

CAS / CASR / CKSR Series: Accuracy

It is also possible to cancel the offset drift of the reference voltage when working over the defined temperature range byusing the same method.

CAS / CASR / CKSR Series: Dynamic performances & Common mode behaviour

Dynamic performances
CAS / CASR / CKSR transducers max response
times (Response time defined at 90 % of IPN)
against a current step at IPN will have a delay of
Max 0.3 µs (Fig. 8).
As a result of the fast response time,a large bandwidth has been verified at
300 kHz @ + / - 3 dB (Fig. 9).

Fig. 8. CASR 50‑NP Response time to a current step of 50 A

Fig. 10a. Typical common mode behaviour(1200 V of voltage variation applied with dv / dt = 20 kV /µs)

Fig. 10b. CASR 50-NP ; Typical common mode behaviour ; VOUT ‑ VREF ;(1200 V of voltage variation applied with dV/dt = 20 kV/µs)

10

The CAS / CASR / CKSR models have been designed
and tested according to latest recognized worldwide
standards for industrial applications:
The EN 50178 standard dedicated to “Electronic
Equipment for use in power installations” in industrial
applications is our standard of reference for electrical,
environmental and mechanical parameters.
It guarantees the overall performances of our products
in industrial environments.

Fig. 9. CASR 50‑NP ‑ Frequency response

Common mode behaviour

CAS / CASR / CKSR products are CE marked asa guarantee of the products compliance to theEuropean EMC directive 89/336/EEC and low voltage
directive. They also comply with the derived local EMC
regulations (EMC: Electro-Magnetic Compatibility).

Common mode noises (dv/dt) are often encountered inapplications using fast switching components like IGBTs. It
is not surprising to encounter switching frequencies up toand even higher than 20 kHz for highly efficient inverters.
The result of a dv/dt between the primary conductor andthe electronic circuit of a current transducer is a capacitive
current perturbating the various electronic componentsthat are sensitive to that.
Any electrical component with a galvanic isolation
between the primary and the secondary circuit has acapacitive coupling between the isolated potentials.
This capacitive current results in an additional error on thetransducer output during a short time.
The error caused by these dv/dt has to be as low as
possible in order to avoid any unwanted activation of a
possible protection circuit, which could lead to a shut
down of the application.
This additional noise caused by the dv/dt can be filtered,
but the best way is to have it at the lowest possible value
and during the shortest time avoiding then any additional
filter to be installed.
For example, a voltage change of 10 kV/µs in combination
with a 10 pF coupling capacity generates a parasitic
output current of 100 mA. For the CAS 25‑NP for example,
this would represent seven times the nominal current.
Fig. 10a shows the behaviour at a voltage change of
20 kV/µs and an applied voltage of + 600 V (total voltage
variation of 1200 V from –600 V to + 600 V) with a
CASR 50‑NP.
Due to CAS – CASR – CKSR low parasitic capacitance,
the effect of dynamic common mode is reduced. We cannotice an interference of about 74 % of IPN during the dv / dt
when measurement VOUT is referenced to 0 V. Note thevery short duration of the disturbance of less than 250 ns,
which can be easily filtered. When VOUT is referenced to
VREF to do the output measurement, then the disturbanceduring dv/dt seen on the output is equal to the difference
between the disturbance on VOUT and the disturbance on
VREF (Fig. 10b). In these conditions, we can notice on the
output signal (VOUT ‑ VREF) an interference of about 55 %of IPN during the dv/dt and 24 % of IPN after the dv/dt, thesignal coming back to its normal state only 350 ns after
the end of the dv/dt.

Insulation and safety
The EN 50178 and IEC 61010-1 standards (“Safety
requirements for electrical equipment for measurement,
control, and laboratory use”) are used as references todesign the creepage and clearance distances versus
the needed insulation levels (rated insulation voltage)
and the conditions of use (as previously seen page 7).
The rated insulation voltage level for transducers in“industrial” applications, is defined according to several
criteria listed under the both standards EN 50178
and IEC 61010-1. Some criteria are dependent on
the transducer itself when the others are linked to theapplication.
The products comply with UL 508C for UR marking.

Reliability and Quality
Of course, reliability and lifetime are guaranteedby the quality in design and process. Accelerated
tests have been performed to estimate failure rate
(temperature cycle and/or humidity test and completecharacterization of the product according to standards).
Beside, the CAS / CASR / CKSR models have been
designed to pass the + 85°C + 85 % relative humidity
test during 1000 hours (transducers power supplied
during the test).
The CAS / CASR / CKSR models are manufactured in
one of the LEM production center that is ISO/TS 16949,
ISO 14001, ISO 9001:2000 and IRIS certified and where
quality tools such as DPT FMEA, Control Plan, Cpk,
R&R, QOS-8D, IPQ, ect are used in addition to the Six
Sigma methodology.

11

CAS / CASR / CKSR Series: Standards & Quality & Reliability

Standards

CAS / CASR / CKSR Series: Application advice

Filtering Vout
The output Vout has a very low output impedance oftypically 2 Ω; it can drive 100 pF directly and shows
50 % overshoot with approximately 1 nF capacitance.
Adding Rf allows much larger capacitive loads. Notethat with Rf of only 20 Ω, the load capacitor should beeither smaller than 1 nF or larger than 33 nF to avoid
overshoot; with Rf of 50 Ω this transient area is avoided.
Empirical evaluation may be necessary to obtain
optimum results.
Example: Filtering the typical 450 kHz frequency of thedetector:
To have an attenuation of 20 dB at 450 kHz, the cutting
frequency of the 1st order filter is chosen at Fc = 45 kHz.
To avoid transient area, the resistance Rf is chosen at
50 Ω.
The filter capacitor is then as per Fig. 11.

Load output resistance: RL
The minimum load resistance of Vout is 1 kOhm.

When the Ref pin is connected to a load, due to theleakage current and internal resistance (680 Ω),
VREF OUT (internal reference) can change and reducethe measuring range. To guarantee the measuring
range:• The leakage current from the Ref pin (source)must be lower than 350 µA when the load isconnected to a voltage > 2.5 V.
• The leakage current from the Ref pin (sink) must
be lower than 4.4 µA when the load is connected
to a voltage < 2.5 V.
• In the Ref in mode, an external reference voltage isconnected to the Ref pin; this voltage is specified
in the range 0 to 4 V and is directly used by thetransducer as the reference point for measurements.
The external reference voltage VREF must be able:
Vref − 2.5• Either to source a typical current of
, the
680
maximum value will be 2.2 mA typ. when VREF = 4 V.
2.5 − Vref

Reference Voltage
If the Ref pin of the transducer is not used it must beleft unconnected.
No special filtering is needed for Ref pin.
The Ref pin has two modes Ref in and Ref out:
• In the Ref out mode, the 2.5 V internal precisionreference is used by the transducer as the reference
point for bipolar measurements; this internal reference
is connected to the Ref pin of the transducer througha 680 Ω resistor. It tolerates sink or source currents
up to ± 5 mA, but the 680 Ω resistor prevents thiscurrent to exceed these limits.

• Or to sink a typical current of
, the
680
maximum value will be 3.68
€mA typ. when VREF = 0 V.
By using an external reference, €it is easier to connect
the transducer to devices such as an ADC.
In most applications, the output of the transducer isconnected to an ADC whose output is processed by
a DSP or a microcontroller.
The internal reference of these DSPs or ADCs can go
down to 1.8 V.
In this application, if you have an internal referencein the DSP with external access, you can supply thetransducer’s reference in with it.

Fig. 11.

Cf =1
2 ∗ π ∗ Rf ∗ Fc

Cf =1
2 ∗ π ∗ 50 ∗ 45E 3

Cf ≥ 70 . 7 nFΩ

R f = 50 _Cf = 82 nF
0V

12Upper limit: IP = -24 x VREF + 111(VREF = 1.29 .. 4 V)

Upper limit: IP = 80

(VREF = 0 .. 1.29 V)

Lower limit: IP = -24 x VREF + 9(VREF = 0 .. 3.7 V)

Lower limit: IP = -80(VREF = 3.7 .. 4V)

Upper limit: IP = -40 x VREF + 185(VREF = 2.5 .. 4 V)

Upper limit: IP = -80 x VREF + 370(VREF = 2.75 .. 4 V)

Upper limit: IP = 85

(VREF = 0 .. 2.5 V)

Upper limit: IP = 150(VREF = 0 .. 2.75 V)

Lower limit: IP = -40 x VREF + 15

(VREF = 0 .. 2.5 V)

Lower limit: IP = -80 x VREF + 30

(VREF = 0 .. 2.25 V)

Lower limit: IP = -85(VREF = 2.5 .. 4 V)

Lower limit: IP = -150

(VREF = 2.25 .. 4V)

Example with VREF = 1.65 V:

Example with VREF = 0 V:

• The 6 A version has a measuring range from -12.24 A to +28.5 A• The 6 A version has a measuring range from +3.6 A to +44.4 A• The 15 A version has a measuring range from -30.6 A to +71.4 A• The 15 A version has a measuring range from +9 A to +80 A• The 25 A version has a measuring range from -51 A to +85 A• The 25 A version has a measuring range from +15 A to +85 A• The 50 A version has a measuring range from -102 A to +150 A• The 50 A version has a measuring range from +30 A to +150 A

13

CAS / CASR / CKSR Series: Application advice(VREF = 0 .. 4 V)

IP (A)

Lower limit: IP = -9.6 x VREF + 3.6(VREF = 0 .. 4 V)

IP (A)

Upper limit: IP = -9.6 xVREF + 44.4

IP (A)IP (A)

The following graphs show how the measuring range of each transducer version depends on the external reference
voltage value VREF:

CAS / CASR / CKSR Series: Application advice

Primary conductor resistanceAt 25 °C, one primary conductor has a resistance of 0.72 mΩ typ.
At 85 °C, one primary conductor has a resistance of 0.88 mΩ typ.

14

Number of primaryconductor

Connection

Temperature

Resistance typ.

3

Parallel

25° C

0.24 mΩ4

Parallel

25° C

0.18 mΩ3

Parallel

85° C

0.29 mΩ4

Parallel

85° C

0.22 mΩ

3

Series25° C

2.16 mΩ

4

Series25° C

2.88 mΩ

3

Series85° C

2.64 mΩ

4

Series85° C

3.52 mΩCAS / CASR / CKSR Series: Typical applications & conclusion

Typical applications & conclusion
The CAS / CASR / CKSR current transducers have been designed mainly for industrial applications requiring:• Good accuracy especially in temperature(low initial offset, low thermal drifts for gain and offset)• Reduced size: CAS / CASR / CKSR are the smallest on the market
in their category (up to nominal current of 50 A RMS)
• High immunity against high voltage variations• High flexibility for specific customer applications(wide choice of current ranges: 6, 15, 25 and 50 A RMS,
each model is multi range, unique packaging)• High Creepage and Clearance distanceswith the CKSR models for higher insulation• Measures the same given performance current as small as
1.5 A RMS with the CKSR 6‑NP model• Resistant in rough environmental conditions of use such as
high humidity combined with high temperature

These advantages are suited for high performance drives,
inverters for new energy integrating a good control of the DC
current injection in the grid, servo drives for wafers production
or highly accurate robots and all kinds of low drift applications.
After all, they have been created to achieve great performancenot only today ‑ but as far into the future as you can imagine.

15

Data sheet CAS / CASR / CKSR series

Absolute maximum ratings
Parameter

Symbol

Unit

Value

VC

V

7

Primary conductor temperature

°C

110

ESD rating, Human Body Model (HBM)kV

4Supply voltage

Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods
may degrade reliability.

Isolation characteristics
Parameter

Unit

CAS
Value

CASR
Value

CKSR
Value

Comment

RMS voltage for AC isolation test 50/60Hz/1 min

Vd

kV

4.2

4.1

4.3

Impulse withstand voltage 1.2/50 µs

^
Vw

kV

7.6

7.5

8

Partial discharge extinction voltage @ 10 pC (rms)

Ve

V

1000

1000

1000

Clearance distance (pri. - sec.)

dCI

mm

7.7

7.5

8.2

Shortest distance through air

Creepage distance (pri. - sec.)

dCp

mm

7.7

7.5

8.2

Shortest pathalong device body (CAS‑CASR)
Shortest internal pathalong device body (CKSR)

Creepage distance (pri. .- sec.)

-

mm

6.3

6.2

-

When mounted on PCB withrecommended layout (CAS‑CASR)

Case material--

Comparative tracking index

CTI

V

Application example--

Reinforced isolation, non uniform field
300 V
300 V
300 V
according to
CAT III PD2 CAT III PD2 CAT III PD2
EN 50178, EN 61010, IEC 60364-4-43

Application example--

Simple isolation, non uniform field
600 V
600 V
1000 V according to EN 50178,
CAT III PD2 CAT III PD2 CAT III PD2 EN 61010,
IEC 60364-4-43

V0
V0
V0
according according according
to UL 94 to UL 94 to UL 94
600

600

600

Environmental and mechanical characteristics
Parameter

SymbolUnit

Min

Ambient operating temperature

TA

°C

-40

85

Ambient storage temperature

TS

°C

-50

105

Mass

m

g

Standards

16

Typ

Max

9

EN 50178, IEC 60950-1, IEC 61010-1, IEC 61326-1, UL 508C

Comment

Data sheet CAS / CASR / CKSR series

Electrical data CAS / CASR / CKSR 6-NP
At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, (internal reference for CASR & CKSR models) unless otherwise noted.

Parameter

SymbolUnit

Primary nominal current rms

IPNA

Primary current, measuring range

IPM

A

Number of primary turns

NP

Supply voltage

VC

V

Current consumption

IC

mA

Reference voltage @ IP = 0 A

VREF

V

2.495

External reference voltage

VREF

V

Output voltage

VOUT

V

Output voltage @ IP = 0 A

VOUT

V

Electrical offset voltage

VOE

mV

Electrical offset current
referred to primary
Temperature coefficient of VREF

Temperature coefficient of VOUT @ IP = 0 A

IOE

TCVREF

TCVOUT

Min

Typ

Max

Comment

6
-20

20

-

1,2,3

for CAS / CASR-

1,2,3,4for CKSR

4.75

5

5.25

I (mA)
15 + PNS

I (mA)
20 + PNS

NS = 1731 turns

2.5

2.505

Internal reference
for CASR / CKSR

0

4

for CASR / CKSR

0.375

4.625
2.5

for CAS

VREF

for CASR / CKSR

-10.4

10.4

-5.3

5.3

100% tested
VOUT - 2.5 V for CAS
VOUT - VREF
for CASR / CKSR

A

-0.1

0.1

100% tested for CAS

mA

-51

51

100% tested
for CASR / CKSR

±5

±50

Internal reference
for CASR / CKSR

±10

±80

ppm/K of 2.5 V- 40°C .. 85°C for CAS

±6

±30

ppm/K of 2.5 V- 40°C .. 85°C for CASR / CKSR

0.7

100% tested±40- 40°C .. 85°C

ppm/K

ppm/K

Theoretical sensitivity

Gth

mV/A

Sensitivity error

εG

%

104.2

Temperature coefficient of G

TCG

ppm/K

Linearity errorεL% of IPN

-0.1

0.1

Magnetic offset current (10 x IPN)
referred to primary

IOM

A

-0.1

0.1

Output current noise (spectral density) rms 100 Hz .. 100 kHz
referred to primaryinoµA/Hz½

Peak-peak output ripple at oscillator frequency
f = 450 kHz (typ.)-mV

Reaction time @ 10 % of IPN

traResponse time @ 90 % of IPN-0.7

625 mV/ IPN

36

RL = 1 kΩ for CAS

20

RL = 1 kΩ for CASR / CKSR

40

160

RL = 1 kΩµs

0.3

RL = 1 kΩ
di/dt = 18 A/µs

tr

µs

0.3

RL = 1 kΩ
di/dt = 18 A/µs

Frequency bandwidth (± 1 dB)

BW

kHz

200

Frequency bandwidth (± 3 dB)

BW

kHz

300

RL = 1 kΩ
RL = 1 kΩ

Overall accuracy

XG% of IPN

Overall accuracy @ TA = 85°C

XG

% of IPN

2.5
1.7
4.6
2.6

AccuracyX% of IPN

0.8

Accuracy @ TA = 85°C

X

% of IPN

3.0
1.8

for CAS
for CASR / CKSR
for CAS
for CASR / CKSR
for CAS
for CASR / CKSR

17

Data sheet CAS / CASR / CKSR series

Electrical data CAS / CASR / CKSR 15-NP
At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, (internal reference for CASR & CKSR models) unless otherwise noted.

Parameter

SymbolUnit

Primary nominal current rms

IPNA

Primary current, measuring range

IPM

A

Number of primary turns

NP

Supply voltage

VC

V

Current consumption

IC

mA

Reference voltage @ IP = 0 A

VREF

V

2.495

External reference voltage

VREF

V

Output voltage

VOUT

V

Output voltage @ IP = 0 A

VOUT

V

Electrical offset voltage

Electrical offset current
referred to primary
Temperature coefficient of VREF

Temperature coefficient of VOUT @ IP = 0 A

VOE

IOE

TCVREF

TCVOUT

Min

Typ

Max

Comment

15
-51

51

-

1,2,3

for CAS / CASR-

1,2,3,4for CKSR

4.75

5

5.25

I (mA)
15 + PNS

I (mA)
20 + PNS

NS = 1731 turns

2.5

2.505

Internal reference
for CASR / CKSR

0

4

for CASR / CKSR

0.375

4.625
2.5

for CAS

VREF

for CASR / CKSR

-7.1

7.1

100% tested
VOUT - 2.5 V for CAS

-2.21

2.21

VOUT - VREF
for CASR / CKSR

A

-0.17

0.17

100% tested for CAS

mA

-53

53

100% tested
for CASR / CKSR

±5

±50

Internal reference
for CASR / CKSR

±7.5

±70

ppm/K of 2.5 V - 40°C .. 85°C
for CAS±2.3±20

ppm/K of 2.5 V - 40°C .. 85°C
for CASR / CKSR

0.7

100% tested±40- 40°C .. 85°C

mV

ppm/K

ppm/K

Theoretical sensitivity

Gth

mV/A

Sensitivity error

εG

%

41.67

Temperature coefficient of G

TCG

ppm/K

Linearity errorεL% of IPN

-0.1

0.1

Magnetic offset current (10 x IPN)
referred to primary

IOM

A

-0.1

0.1

Output current noise (spectral density) rms
100 Hz .. 100 kHz referred to primaryinoµA/Hz½

Peak-peak output ripple at oscillator frequency
f = 450 kHz (typ.)-mV

Reaction time @ 10 % of IPN

traResponse time @ 90 % of IPN-0.7

625 mV/ IPN90

RL = 1 kΩ for CAS

20

RL = 1 kΩ for CASR / CKSR

1560

RL = 1 kΩµs

0.3

RL = 1 kΩ
di/dt = 44 A/µs

tr

µs

0.3

RL = 1 kΩ
di/dt = 44 A/µs

Frequency bandwidth (± 1 dB)

BW

kHz

200

Frequency bandwidth (± 3 dB)

BW

kHz

300

RL = 1 kΩ
RL = 1 kΩ

Overall accuracy

XG% of IPN

Overall accuracy @ TA = 85°C

XG

% of IPN

1.9
1.2
3.9
1.9

AccuracyX% of IPN

0.8

Accuracy @ TA = 85°C

X

% of IPN

2.7
1.5

18

for CAS
for CASR / CKSR
for CAS
for CASR / CKSR
for CAS
for CASR / CKSR

Data sheet CAS / CASR / CKSR series

Electrical data CAS / CASR / CKSR 25-NP
At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, (internal reference for CASR & CKSR models) unless otherwise noted.

Parameter

SymbolUnit

Primary nominal current rms

IPNA

Primary current, measuring range

IPM

A

Number of primary turns

NP

Supply voltage

VC

V

Current consumption

IC

mA

Reference voltage @ IP = 0 A

VREF

V

2.495

External reference voltage

VREF

V

Output voltage

VOUT

V

Output voltage @ IP = 0 A

VOUT

V

Electrical offset voltage

VOE

mV

Electrical offset current
referred to primary
Temperature coefficient of VREF

Temperature coefficient of VOUT @ IP = 0 A

IOE

TCVREF

TCVOUT

Min

Typ

Max

Comment

25
-85

85

-

1,2,3

for CAS / CASR-

1,2,3,4for CKSR

4.75

5

5.25

I (mA)
15 + PNS

I (mA)
20 + PNS

NS = 1731 turns

2.5

2.505

Internal reference
for CASR / CKSR

0

4

for CASR / CKSR

0.375

4.625
2.5

for CAS

VREF

for CASR / CKSR

-6.25

6.25

-1.35

1.35

100% tested
VOUT - 2.5 V for CAS
VOUT - VREF
for CASR / CKSR

A

-0.25

0.25

100% tested for CAS

mA

-54

54

100% tested
for CASR / CKSR

±5

±50

Internal reference
for CASR / CKSR

±6.5

±60

ppm/K of 2.5 V - 40°C .. 85°C
for CAS±1.4±10

ppm/K of 2.5 V - 40°C .. 85°C
for CASR / CKSR

0.7

100% tested±40- 40°C .. 85°C

ppm/K

ppm/K

Theoretical sensitivity

Gth

mV/A

Sensitivity error

εG

%

25

Temperature coefficient of G

TCG

ppm/K

Linearity errorεL% of IPN

-0.1

0.1

Magnetic offset current (10 x IPN)
referred to primary

IOM

A

-0.1

0.1

Output current noise (spectral density) rms
100 Hz .. 100 kHz referred to primaryinoµA/Hz½

Peak-peak output ripple at oscillator frequency
f = 450 kHz (typ.)-mV

Reaction time @ 10 % of IPN

traResponse time @ 90 % of IPN-0.7

625 mV/ IPN

150

RL = 1 kΩ for CAS

20

RL = 1 kΩ for CASR / CKSR

1040

RL = 1 kΩµs

0.3

RL = 1 kΩ
di/dt = 68 A/µs

tr

µs

0.3

RL = 1 kΩ
di/dt = 68 A/µs

Frequency bandwidth (± 1 dB)

BW

kHz

200

Frequency bandwidth (± 3 dB)

BW

kHz

300

RL = 1 kΩ
RL = 1 kΩ

Overall accuracy

XG% of IPN

Overall accuracy @ TA = 85°C

XG

% of IPN

1.8
1
3.5
1.5

AccuracyX% of IPN

0.8

Accuracy @ TA = 85°C

X

% of IPN

2.5
1.3

for CAS
for CASR / CKSR
for CAS
for CASR / CKSR
for CAS
for CASR / CKSR

19

Data sheet CAS / CASR / CKSR series

Electrical data CAS / CASR / CKSR 50-NP
At TA = 25°C, VC = + 5 V, NP = 1 turn, RL = 10 kΩ, (internal reference for CASR & CKSR models) unless otherwise noted.

Parameter

SymbolUnit

Primary nominal current rms

IPNA

Primary current, measuring range

IPM

A

Number of primary turns

NP

Supply voltage

VC

V

Current consumption

IC

mA

Reference voltage @ IP = 0 A

VREF

V

2.495

External reference voltage

VREF

V

Output voltage

VOUT

V

Output voltage @ IP = 0 A

VOUT

V

Electrical offset voltage

VOE

mV

Electrical offset current
referred to primary
Temperature coefficient of VREF

Temperature coefficient of VOUT @ IP = 0 A

IOE

TCVREF

TCVOUT

Min

Typ

Max

Comment

50
-150

150

-

1,2,3

for CAS / CASR-

1,2,3,4for CKSR

4.75

5

5.25

I (mA)
15 + PNS

I (mA)
20 + PNS

NS = 966 turns

2.5

2.505

Internal reference
for CASR / CKSR

0

4

for CASR / CKSR

0.375

4.625
2.5

for CAS

VREF

for CASR / CKSR

-5.8

5.8

-0.7250.725

100% tested
VOUT - 2.5 V for CAS
VOUT - VREF
for CASR / CKSR

A

-0.46

0.46

100% tested for CAS

mA

-58

58

100% tested
for CASR / CKSR

±5

±50

Internal reference
for CASR / CKSR

±6

±60

ppm/K of 2.5 V - 40°C .. 85°C
for CAS±0.7±7

ppm/K of 2.5 V - 40°C .. 85°C
for CASR / CKSR

0.7

100% tested±40- 40°C .. 85°C

ppm/K

ppm/K

Theoretical sensitivity

Gth

mV/A

Sensitivity error

εG

%

12.5

Temperature coefficient of G

TCG

ppm/K

Linearity errorεL% of IPN

-0.1

0.1

Magnetic offset current (10 x IPN)
referred to primary

IOM

A

-0.1

0.1

Output current noise (spectral density) rms
100 Hz .. 100 kHz referred to primaryinoµA/Hz½

Peak-peak output ripple at oscillator frequency
f = 450 kHz (typ.)-mV

Reaction time @ 10 % of IPN

traResponse time @ 90 % of IPN-0.7

625 mV/ IPN

300

RL = 1 kΩ for CAS

20

RL = 1 kΩ for CASR / CKSR

520

RL = 1 kΩµs

0.3

RL = 1 kΩ
di/dt = 100 A/µs

tr

µs

0.3

RL = 1 kΩ
di/dt = 100 A/µs

Frequency bandwidth (± 1 dB)

BW

kHz

200

Frequency bandwidth (± 3 dB)

BW

kHz

300

RL = 1 kΩ
RL = 1 kΩ

Overall accuracy

XG% of IPN

Overall accuracy @ TA = 85°C

XG

% of IPN

1.7
0.9
3.4
1.3

AccuracyX% of IPN

0.8

Accuracy @ TA = 85°C

X

% of IPN

2.5
1.2

20

for CAS
for CASR / CKSR
for CAS
for CASR / CKSR
for CAS
for CASR / CKSRCAS Series

CASR Series

PCB footprint:* = Pad design according
to IPC 2222, IPC 2221

Data sheet CAS / CASR / CKSR series

PCB footprints
CKSR Series

PCB footprint:* = Pad design according

to IPC 2222, IPC 2221

PCB footprint:* = Pad design according
to IPC 2222, IPC 2221

Dimensions in mm. 1 mm = 0.0394 inches

SafetymThis transducer must be used in electric/electronic equipmentwith respect to applicable standards and safety requirements inaccordance with the manufacturer’s operating instructions

Assembly on PCB
Recommended PCB hole diameter 1.3 mm for primary pin
0.8 mm for secondary pin
Maximum PCB thickness

2.4 mmWave soldering profile
No clean process only.

maximum 260°C for 10 scCaution, risk of electrical shock
When operating the transducer, certain parts of the module cancarry hazardous voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a built-in device, whose conducting parts must
be inaccessible after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.

21

Data sheet CAS / CASR / CKSR series

Dimensions (in mm. General linear tolerance ± 0.25 mm)
CAS Series
Bottom view

Front view
Connection
Side view

CASR Series
Bottom view

Front view
Connection
Side view

CKSR Series
Bottom view

Front view
Connection
Side view22

LEM’s Warranty
5 Year Warranty
on LEM Transducers
We design and manufacture high quality and highly reliable
products for our customers all over the world.
We have delivered several million current and voltage transducers since 1972 andmost of them are still being used today for traction vehicles, industrial motor drives,
UPS systems and many other applications requiring high quality standards.
The LEM 5-year warranty applies to all LEM transducers
and is valid in addition to the legal warranty.
The warranty granted on LEM transducers is for a period of 5
years (60 months) from the date of their delivery.
During this period LEM shall replace or repair all defective parts at its’ cost(provided the defect is due to defective material or workmanship).
Additional claims as well as claims for the compensation of damages, which do
not occur on the delivered material itself, are not covered by this warranty.
All defects must be notified to LEM immediately and faulty material must
be returned to the factory along with a description of the defect.
Warranty repairs and or replacements are carried out at LEM’s discretion.
The customer bears the transport costs. An extension of the warranty period
following repairs undertaken under warranty cannot be granted.
The warranty becomes invalid if the buyer has modified or repaired, or has had
repaired by a third party the material without LEM’s written consent.
The warranty does not cover any damage caused by incorrect
conditions of use and cases of force majeure.
No responsibility will apply except legal requirements regarding product liability.
The warranty explicitly excludes all claims exceeding the above conditions.
LEM, April 1. 2008

Paul Van Iseghem
President & CEO LEM

23

Europe • Middle East
Africa • America
Asia • Pacific

LEM International Sales Representatives

Austria
LEM Components
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Tel. +43 1 903 60 10 40
Fax +43 1 903 60 10 42
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Tel. : +32 67 55 01 14
Fax : +32 67 55 01 15
e-mail : lbe@lem.com
Bosnia, Croatia, Herzegovina,
Serbia and Slovenia
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I-34147 Muggia-Aquilinia
Tel. +39 040 23 21 88
Fax +39 040 23 24 40
e-mail: dino.fabiani@
proteuselectric.it
Czech Republic, Slovakia
PE & ED Spol. S.R.O.
Koblovska 101/23
CZ-71100 Ostrava/Koblov
Tel. +420 59 6239256
Fax +420 59 6239531
e-mail: peedova@peed.cz
Denmark
Motron A/S
Torsovej 4
DK-8240 Risskov
Tel. +45 87 36 86 00
Fax +45 87 36 86 01
e-mail: motron@motron.dk

FinlandETRA Electronics Oy
Lampputie 2
FI-00740 Helsinki
Tel. +358 207 65 160
Fax +358 207 65 23 11
e-mail: markku.soittila@etra.fi
Field Applications Engineer
Mr. Pasi Leveälahti
Kausantie 668, 17150 Urajärvi
Tel. +358 50 5754435
Fax +358 37667 141
e-mail: pli@lem.com
FranceLEM France Sarl
15, avenue Galois
F. 92340 Bourg-La-Reine
Tel. +33 1 45 36 46 20
Fax +33 1 45 36 06 16
e-mail: lfr@lem.com
Germany
Central Office:
LEM Deutschland GmbH
Frankfurter Strasse 74
D-64521 Gross-Gerau
Tel. +49 6152 9301 0
Fax +49 6152 8 46 61
e-mail: postoffice.lde@lem.com
Hauber & Graf Electronics GmbH
Bavaria / Baden Württemberg
Wahlwiesenstr. 3
D-71711 Steinheim
Tel. +49 7144 28 15 03/04
Fax +49 7144 28 15 05
e-mail: electronics@hauber-graf.de
Hungary
Orszaczky Trading LTD.
Korányi Sandor U, 28
H-1089 Budapest
Tel. +36 1 314 4225
Fax +36 1 324 8757
e-mail: info@orszaczky.hu

Iran
MGT
Mansoureh Tehrani
IR-TehranTel. +9821 22 37 46 05
Fax +9821 22 37 46 04
Mobile + 98912 113 81 56
e-mail: mgt@tavana.net
IsraelOfer Levin TechnologicalApplication
PO Box 18247
IL- Tel Aviv 611 81
Tel.+972 3 5586279
Fax +972 3 5586282
e-mail: ol_teap@netvision.net.il
Italy
LEM Italia Srl
via V. Bellini, 7I-35030 Selvazzano Dentro, PD
Tel. +39 049 805 60 60
Fax +39 049 805 60 59
e-mail: lit@lem.com
NorwayHolst & Fleischer A/SStanseveien 6B
N-0975 OsloTel. +47 2333 8500
Fax +47 2333 8501
e-mail: hf@hf-elektro.no
PolandDACPOL Sp. z o.o.
Ul. Pulawska 34
PL-05-500 Piaseczno
Tel. +48 22 70335100
Fax +48 22 7035101
e-mail: dacpol@dacpol.com.pl
Portugal
QEnergia, Lda
Praceta Cesário Verde - 10 S/CaveP-2745-740 MassamáTel. +351 214 309320
Fax +351 214 309299
e-mail: qenergia@qenergia.pt

Romania
SYSCOM -18 Srl.
Protopopescu 10, bl. 4. ap 2 Sector 1
RO-011728 Bucharest
Tel. +40 21 310 26 78
Fax +40 21 316 91 76
e-mail:george.barbalata@syscom18.com
RussiaCentral Office:
TVELEM
Marshall Budionny Str.11
170023 Tver / Russia
Tel. +7 48 22 743 951
Fax +7 48 22 743 955
e-mail: tvelem@lem.com
TVELEM
Baltijskaja str., 13, Room 19125190 Moscow
Tel. +7 495 363 07 67
Fax +7 495 363 07 67
e-mail: tvelem@alo.ru
TVELEM
V.O., 2 linia, 19, Liter „A“
199053 S. Petersburg
Tel. +7 812 323 83 83
Fax +7 812 323 83 83
e-mail: info@maglem.ru
Slovenia
Proteus ElectricVia di Noghere 94/1
I-34147 Muggia-Aquilinia
Tel. +39 040 23 21 88
Fax +39 040 23 24 40
e-mail:dino.fabiani@proteuselectric.it
Spain
LEM Components
Apartado 142
E-08500 VIC
Tel. +34 93 886 02 28
Fax +34 93 886 60 87
e-mail: slu@lem.com

SwedenADIATOR A.B.
Hälsingegatan 40
SE-10435 Stockholm
Tel. +46 8 729 1700
Fax +46 8 729 1717
e-mail: info@adiator.se
Beving Electronik AB
Storsätragränd 10
S. 12739 Skärholmen
Tel. +46 8 680 1199
Fax +46 8 680 1188
e-mail: lars.g.pahlsson@beving.se
Switzerland
SIMPEX Electronic AG
Binzackerstrasse 33
CH-8622 Wetzikon
Tel. +41 1 931 10 10
Fax +41 1 931 10 11
e-mail: contact@simpex.ch
LEM SA
8, Chemin des Aulx
CH-1228 Plan-les-Ouates
Tel. +41 22 706 11 11
Fax +41 22 794 94 78
e-mail: lsa@lem.com
TurkeyÖzdisan Electronik Pazarlama
Galata Kulesi Sokak N° 34
TR-80020 Kuledibi / Istanbul
Tel. +90 212 2499806
Fax +90 212 2436946
e-mail: oabdi@ozdisan.com
Ukraine“SP DACPOL” Co Ltd.
Snovskaya str., 20
UA-02090, KIEV, UKRAINE
Tel. +380 44 501 93 44
Fax +380 44502 64 87
e-mail: kiev@dacpol.com
United Kingdom and Eire
LEM UK Ltd
West Lancs Investment Centre
Whitemoss Business Park
Skelmersdale, Lancs WN8 9TG
Tel. +44 1 695 71 25 60
Fax +44 1 695 71 25 61
e-mail: luk@lem.com

Argentina
Semak S.A.
Av. Belgrano 1580, 5° Piso
AR-1093 BUENOS AIRES
Tel. +54 11 4381 2108
Fax +54 11 4383 7420
e-mail: mpedro@semak.
com.arBrazilAMDS4 Imp. Exp. e Com. deEquip. Electr. Ltda.
Rua Doutor Ulhôa Cintra, 489,
Centro 13800-061 Moji Mirim - Sao Paulo - Brazil
Tel. +55 19 3806 1950 / 8509
Fax +55 19 3806 8422
e-mail:jeduardo@amds4.com.br

Canada Ontario East
Optimum Components Inc.
7750 Birchmount Road Unit 5
CAN-Markham ON L3R 0B4
Tel. +1 905 477 9393
Fax +1 905 477 6197

South Africa
Denver Technical Products Ltd.
P.O. Box 75810
SA-2047 Garden View
Tel. +27 11 626 20 23

LEM U.S.A., Inc
991, Michigan Avenue.
USA-Columbus, OH 43201
Tel. +1 414 353 07 11 ext. 200
Fax +1 614 540 74 36
Mobile +1 614 306 73 02
e-mail: afg@lem.com

LEM U.S.A., Inc.
6275 Simms st.
Suite # 110
USA Arvada, CO 80004
Tel. +1 800 236 53 66 ext. 201
Fax +1 303 403 15 89
e-mail: dlw@lem.com

Australia and New Zealand
Fastron Technologies Pty Ltd.
25 Kingsley Close
Rowville - Melbourne Victoria 3178
Tel. +61 3 9763 5155
Fax +61 3 9763 5166e-mail: sales@fastron.com.au
China
Beijing LEM Electronics Co. Ltd
No. 1 Standard Factory
Building B, Airport Industry
Area, Beijing, China
Post code : 101300
Tel. +86 10 80 48 31 78
Fax +86 10 80 48 43 03
e-mail: bjl@lem.com
Beijing LEM Electronics Co. Ltd
Shanghai Office
Room 807
728, Xinhua Road
Shanghai, 200052 P.R. China
Tel. +86 21 3226 0881
Fax +86 21 5258 2262
e-mail: bjl@lem.com

Beijing LEM Electronics Co. Ltd
Shenzhen Office
Room 1205
6021 Shennan Road
Shenzen, 518040 P.R. China
Tel. +86 755 3334 0779
+86 755 3336 9609
Fax +86 755 3334 0780
e-mail: bjl@lem.com
India
LEM Management Services SA
India Branch Office
Mr. Sudhir Khandekar
Tel. +91 98 331 35 223
e-mail: skh@lem.com
Globetek
122/49, 27th Cross
7th Block, Jayanagar
IN-Bangalore-560082
Tel. +91 80 2 663 57 76
Fax +91 80 2 653 40 20
e-mail: globetek@vsnl.com

e-mail: mikep@
optimumcomponents.com

Canada Manitoba West
William P. Hall Contract Services
7045 NE 137th st.
CAN-Kirkland,
Washington 98034
Tel. +1 425 820 6216
Fax +1 206 390 2411

Fax +27 11 626 20 09
e-mail: denvertech@pixie.co.za
U.S.A
Central Office:LEM U.S.A., Inc.
11665 West Bradley Road
USA Milwaukee, Wi 53224
Tel. +1 414 353 07 11
Toll free: 800 236 53 66
Fax +1 414 353 07 33
e-mail: lus@lem.com

Japan
LEM Japan K.K.
2-1-2 Nakamachi
J-194-0021Machida-Tokyo
Tel. +81 4 2725 8151
Fax +81 4 2728 8119
e-mail: ljp@lem.com
LEM Japan K.K.
1-8-33-607 Nishimiyahara
Yodogawa-Ku Osaka
532-0004 Japan
Tel. +81 6 6395 4073
Fax +81 6 6395 4079
e-mail: ljp@lem.com
Korea
S&H Trading#Ra-3701, Jungang Yootong Danji
1258, Kurobon-Dong, Kuro-Ku,
K-Seoul, 152-721
Tel. +82 2 2686 83 46+82 2 2613 83 45
Fax +82 2 2686 83 47
e-mail: snhlim@yahoo.co.kr

Distributor

LEM International SA
8, Chemin des Aulx, CH-1228 Plan-les-Ouates
Tel. +41/22/7 06 11 11, Fax +41/22/7 94 94 78
e-mail: Isa@lem.com; www.lem.com
Publication CH 29100 E/US (02.09 • 6.5 / 3.5 • CDH)

LEM U.S.A., Inc.
37 Thornton Ferry Road II
USA-Amherst, NH 03031
Tel. +1 800 236 53 66 ext. 202
Fax +1 603 672 71 59
e-mail: gap@lem.com

Young Woo Ind. Co.
C.P.O. Box 10265
K-SeoulTel. +82 312 66 88 58
Fax +82 312 66 88 57
e-mail: c.k.park@ygwoo.co.kr
Malaysia
Acei Systems SDN BHD
1A & 1A-1, Lintasan
Perajurit 6,
Taman Perak
31400 Ipoh
Perak Darul Ridzuan
Malaysia
Tel. +60 5 547 0761/0771
Fax +60 5 547 1518
e-mail: enquiry@aceisys.com.my
Singapore
Overseas Technology Center Pte Ltd.
Blk 1003 Bukit
Merah Central
Unit 06-16
Technopreneur Centre
RS-159 836 Singapore
Tel. +65 6 272 60 77
Fax +65 6 278 21 34
e-mail: otcpl@singnet.com.sg

TaiwanPOWERTRONICS CO. LTD
2F, No 138, Sec. 3
Chung-shing Rd, Shing-Tien,
Taipei -Hsien 231, Taiwan, R.O.C.
Tel. +886 2 2915 7000
Fax +886 2 2915 3910
e-mail: sales@powertronics.
com.tw
Tope Co., Ltd.
3F-4, 716 Chung Cheng Road
Chung Ho City, Taipei Hsien,
Taiwan 235, R.O.C
Tel. +886 2 8228 0658
Fax +886 2 8228 0659
e-mail: tope@ms1.hinet.net